jstat
GC case of a service for viewing on the server.
General use jstat –gcpidor jstat –utilpidtime intervals - every certain period of time (specified time interval) pid output once the process of memory and gc situation.
- Class loading statistics (-class)
| The number of loaded class |
Occupied space |
Quantity is not loaded |
No load space |
time |
[lillcol@node1 lillcol]# jstat -class 22363
Loaded Bytes Unloaded Bytes Time
19410 39919.5 112 155.0 10.18
- Compile statistics (-compiler)
| Number compilation |
The number of failures |
Not quantifiable |
time |
Type of failure |
Failure of the method |
[lillcol@node1 lillcol]# jstat -compiler 22363
Compiled Failed Invalid Time FailedType FailedMethod
25021 2 0 71.64 1 org/apache/spark/ContextCleaner$$anonfun$org$apache$spark$ContextCleaner$$keepCleaning$1 apply$mcV$sp
- JVM compile statistical (-printcompilation)
| Compiled |
The number of recently compiled method |
| Size |
Recently the number of byte code compiled method |
| Type |
Compile recent compilation method of the type |
| Method |
Method name identification |
[lillcol@node1 lillcol]# jstat -printcompilation 22363
]Compiled Size Type Method
28252 1074 1 org/apache/kafka/clients/consumer/internals/ConsumerNetworkClient isUnavailable
- Garbage collection statistics (-gc)
| S0C |
Size of the first surviving area |
| S1C |
The second area the size of surviving |
| S0U |
Use size of the first surviving area |
| S1U |
Use the size of the second zone of surviving |
| EC |
The size of the area of the Garden of Eden |
| I |
Use the size of the area of the Garden of Eden |
| OC |
Size years old |
| OR |
Use old's size |
| MC |
Methods district size |
| MU |
The method of using the size of the area |
| CCSC |
Compression class space |
| Crcshu |
Compression use of space size |
| CVL |
The number of the young generation garbage recycling |
| YGCT |
The young generation garbage collection time-consuming |
| FGC |
Number of garbage collections years old |
| FGCT |
Garbage Collection's old time-consuming |
| GCT |
Total time consuming garbage collection |
[lillcol@node1 lillcol]# jstat -gc 22363
' S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT
20480.0 21504.0 0.0 8046.8 303104.0 70274.5 260608.0 177324.4 118860.0 116592.4 16460.0 15856.7 105 1.333 6 0.693 2.026
- Heap memory statistics (-gccapacity)
| NGCMN |
Cenozoic minimum capacity |
| NGCMX |
Cenozoic maximum capacity |
| NGC |
Current new generation capacity |
| S0C |
The first area the size of a survivor |
| S1C |
The second area the size of surviving |
| EC |
The size of the area of the Garden of Eden |
| OGCMN |
Old's minimum capacity |
| OGCMX |
Old's maximum capacity |
| OGC |
Old's current size |
| OC |
Old's current size |
| MCMN |
The minimum capacity Metadata |
| MCMX |
The maximum capacity of the metadata |
| MC |
Current metadata space |
| CCSMN |
Class minimum compression space |
| CCSMX |
Class size maximum compression space |
| CCSC |
The current class compression space |
| CVL |
The young generation the number of gc |
| FGC |
GC's old number |
[lillcol@node1 lillcol]# jstat -gccapacity 22363
NGCMN NGCMX NGC S0C S1C EC OGCMN OGCMX OGC OC MCMN MCMX MC CCSMN CCSMX CCSC YGC FGC
41472.0 349184.0 349184.0 512.0 512.0 348160.0 83456.0 699392.0 317440.0 317440.0 0.0 1153024.0 120908.0 0.0 1048576.0 16716.0 419 8
- The new generation garbage collection statistics (-gcnew)
| S0C |
The first area the size of a survivor |
| S1C |
The second area the size of surviving |
| S0U |
Use size of the first surviving area |
| S1U |
Use the size of the second zone of surviving |
| TT |
The number of objects in the new generation of survival |
| MTT |
The maximum number of objects in the new generation of survival |
| DSS |
Survived desired area size |
| EC |
The size of the area of the Garden of Eden |
| I |
Use the size of the area of the Garden of Eden |
| CVL |
The number of the young generation garbage recycling |
| YGCT |
The young generation garbage collection time-consuming |
[lillcol@node1 lillcol]# jstat -gcnew 22363
S0C S1C S0U S1U TT MTT DSS EC EU YGC YGCT
512.0 512.0 0.0 128.0 15 15 512.0 348160.0 97478.9 1341 5.736
- The new generation garbage collection statistics (-gcnewcapacity)
| NGCMN |
Cenozoic minimum capacity |
| NGCMX |
Cenozoic maximum capacity |
| NGC |
Current new generation capacity |
| S0CMX |
The maximum size of the surviving Zone 1 |
| S0C |
The current size of the surviving Zone 1 |
| S1CMX |
The largest surviving area the size of 2 |
| S1C |
当前幸存2区大小 |
| ECMX |
最大伊甸园区大小 |
| EC |
当前伊甸园区大小 |
| YGC |
年轻代垃圾回收次数 |
| FGC |
老年代回收次数 |
[lillcol@node1 lillcol]# jstat -gcnewcapacity 22363
NGCMN NGCMX NGC S0CMX S0C S1CMX S1C ECMX EC YGC FGC
41472.0 349184.0 349184.0 116224.0 512.0 116224.0 512.0 348160.0 348160.0 2416 10
- 老年代垃圾回收统计(-gcold)
| MC |
方法区大小 |
| MU |
方法区使用大小 |
| CCSC |
压缩类空间大小 |
| CCSU |
压缩类空间使用大小 |
| OC |
老年代大小 |
| OU |
老年代使用大小 |
| YGC |
年轻代垃圾回收次数 |
| FGC |
老年代垃圾回收次数 |
| FGCT |
老年代垃圾回收消耗时间 |
| GCT |
垃圾回收消耗总时间 |
[lillcol@node1 lillcol]# jstat -gcold 22363
MC MU CCSC CCSU OC OU YGC FGC FGCT GCT
121164.0 118770.2 16716.0 16085.7 317440.0 309862.2 1433 8 1.024 7.017
- 老年代内存统计(-gcoldcapacity)
| OGCMN |
老年代最小容量 |
| OGCMX |
老年代最大容量 |
| OGC |
当前老年代大小 |
| OC |
老年代大小 |
| YGC |
年轻代垃圾回收次数 |
| FGC |
老年代垃圾回收次数 |
| FGCT |
老年代垃圾回收消耗时间 |
| GCT |
垃圾回收消耗总时间 |
[lillcol@node1 lillcol]# jstat -gcoldcapacity 22363
OGCMN OGCMX OGC OC YGC FGC FGCT GCT
83456.0 699392.0 317440.0 317440.0 1488 8 1.024 7.164
- 元数据空间统计(-gcmetacapacity)
| MCMN |
最小元数据容量 |
| MCMX |
最大元数据容量 |
| MC |
当前元数据空间大小 |
| CCSMN |
最小压缩类空间大小 |
| CCSMX |
最大压缩类空间大小 |
| CCSC |
当前压缩类空间大小 |
| YGC |
年轻代垃圾回收次数 |
| FGC |
老年代垃圾回收次数 |
| FGCT |
老年代垃圾回收消耗时间 |
| GCT |
垃圾回收消耗总时间 |
[lillcol@node1 lillcol]# jstat -gcmetacapacity 22363
MCMN MCMX MC CCSMN CCSMX CCSC YGC FGC FGCT GCT
0.0 1155072.0 121420.0 0.0 1048576.0 16716.0 1529 9 1.151 7.574
- 总结垃圾回收统计(-gcutil)
| S0 |
幸存1区当前使用比例 |
| S1 |
幸存2区当前使用比例 |
| E |
伊甸园区使用比例 |
| O |
老年代使用比例 |
| M |
元数据区使用比例 |
| CCS |
压缩使用比例 |
| YGC |
年轻代垃圾回收次数 |
| FGC |
老年代垃圾回收次数 |
| FGCT |
老年代垃圾回收消耗时间 |
| GCT |
垃圾回收消耗总时间 |
[lillcol@node1 lillcol]# jstat -gcutil 22363
S0 S1 E O M CCS YGC YGCT FGC FGCT GCT
25.00 0.00 59.99 74.55 97.84 96.10 1610 6.642 9 1.151 7.794